I post because I would like to help somebody to do it if they don't know how and want to do something with that old pentium 100 that never uses.
EDIT: It is great too for music and general archive backup, just connect the ethernet cable to your main computer and do a synchronisation via FTP. Now I don't burn more cd's as backup, and I am happy as I know I won't never loose my music collection due virus, hard disc problem....